I book the tour without really knowing what to expect, and I have to confess it was a great surprise! Leaving a side the fact that it was pretty well organized, Daniel, our driver/tour guy/John Snow lost brother, was extremely nice and made the whole experience even better.
The tour basically consist in wine tasting in three different wineries, with completely different styles. The Valley produce nice white wines, but if you want to have a red wine, I recommend you to have a Syrah (given the weather of the Valley) is other red varieties do not grow/ripe as they should.
In terms of price quality of the tour, I think it's a best value, given the fact that you have included in the price transportation (nice bus, with aircon), tasting of wine/vodka and liquors..and some food (cheese, spices and chocolates). Do keep in mind that it is tasting of food, therefore the quantities are not big, but they have really good quality. You also have lunch included, so you are not going to get hungry during the tour. In fact, after a whole day of tasting wines and food, you may skip dinner at night.